Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 694	$ 1,197
Derivative Liabilities	$ (605)	$ (1,172)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Derivative Asset, Current, Derivative Asset, Noncurrent	Derivative Asset, Current, Derivative Asset, Noncurrent
Current derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 488	$ 910
Noncurrent derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	206	287
Current derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(441)	(847)
Noncurrent derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(164)	(325)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	20	0
Derivative Liabilities	0	(16)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	(1)	(3)
Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	428	637
Derivative Liabilities	(410)	(615)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	187	421
Derivative Liabilities	(150)	(388)
Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	58	139
Derivative Liabilities	(44)	(150)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	20	0
Derivative Liabilities	(1)	(18)
Derivatives designated as hedging instruments \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	20	0
Derivative Liabilities	0	(16)
Derivatives designated as hedging instruments \| Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(1)	(2)
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	674	1,197
Derivative Liabilities	(604)	(1,154)
Derivatives not designated as hedging instruments \| Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	1	0
Derivative Liabilities	0	(1)
Derivatives not designated as hedging instruments \| Natural gas
Derivatives, Fair Value [Line Items]
Derivative Assets	428	637
Derivative Liabilities	(410)	(615)
Derivatives not designated as hedging instruments \| Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	187	421
Derivative Liabilities	(150)	(388)
Derivatives not designated as hedging instruments \| Environmental & Other
Derivatives, Fair Value [Line Items]
Derivative Assets	58	139
Derivative Liabilities	(44)	(150)
Derivatives not designated as hedging instruments \| Derivative assets — FTRs \| Other current assets \| DTE Electric
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 9	$ 7

Indicates line item in statement of financial position that includes derivative asset.

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